Have done a clean install of 102.0.4880.51 and all seems to be working OK now. Just have to set it all up again.

There is something odd going on, I tried the update and it seemed to install OK but at the end when I clicked 'relanuch now' it went back to the same page saying "Your version is 102.0.4880.46" and "Restart Opera to update to version 102.0.4880.51" and it seems to be stuck in that loop now. So I haven't tried any of your suggestion's yet.
It seems to be looking like a clean install might be needed.
I then found I couldn't submit this reply from opera and had to do it from ms edge.

Have done a clean install of 102.0.4880.51 and all seems to be working OK now. Just have to set it all up again.

There is something odd going on, I tried the update and it seemed to install OK but at the end when I clicked 'relanuch now' it went back to the same page saying "Your version is 102.0.4880.46" and "Restart Opera to update to version 102.0.4880.51" and it seems to be stuck in that loop now. So I haven't tried any of your suggestion's yet.
It seems to be looking like a clean install might be needed.
I then found I couldn't submit this reply from opera and had to do it from ms edge.

Opera stopped opening links from external sources such as in emails since it updated to 'Opera One(version: 102.0.4880.46)'.
I have tried disabling extensions etc. I did set edge to be default browser and it opens links in emails but if i reset opera to be default browser nothing happens.
I have resisted a reinstall so far as find the opera sync never works very well and it takes me ages to get it running properly again.

Sort-of found a fix, resetting the passphrase and sync did not do anything, it was still displaying the wrong one all the time so uninstalled and reinstalled but now it is syncing and not asking for a passphrase, my normal opera log-in seems to be all that is required.

No, it said it was the wrong passphrase but it will not let me correct it or delete it. I am not sure if something else caused it as the only difference is that the first letter is capitalised and I don't believe i did that, I am wondering if it is some of the win 11 autocorrect stuff that might have done it.

I was having a look at opera one and entered one character wrong in the passphrase for sync and it won't let me change it.
Even after shutting opera down and restarting the incorrect passphrase is still in the box, how do I edit or delete it so I can enter the correct one?

@cybagirlgaming It took me several attempts to get it working and I have had to turn it off now as all sorts of strange stuff was happening.
I did something like the following (I think), I hadn't set one before that but it seemed to think I had, go to https://www.sync.opera.com/ and click on Reset Passphrase then go to opera://settings/syncSetup in the browser and select 'data is encrypted with passphrase' in the encryption options at the bottom and it might (?) let you have another go.

Could it have synced from the laptop that I have been trying to get to sync from the desktop? There were a few strange things going on for a while until I turned sync off on both of them.

@leocg That seems to have worked, thanks. Though I found a lot of the setup I had done on opera, like importing bookmarks and passwords had all gone after the reset so I don't think I will be using it now.

@leocg Thanks but I have been trying that and I keep getting told any pass phrase I try to enter is incorrect. I have never put one in before.